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/*******************************************************************************
* ============LICENSE_START==================================================
* * org.onap.dmaap
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * ===========================================================================
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package org.onap.dmaap.datarouter.node;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Arrays;
/**
* Determine if an IP address is from a machine.
*/
public class IsFrom {
private static final EELFLogger logger = EELFManager.getInstance().getLogger(IsFrom.class);
private long nextcheck;
private String[] ips;
private String fqdn;
/**
* Create an IsFrom for the specified fully qualified domain name.
*/
public IsFrom(String fqdn) {
this.fqdn = fqdn;
}
/**
* Configure the JVM DNS cache to have a 10 second TTL. This needs to be called very very early or it won't have
* any effect.
*/
public static void setDNSCache() {
java.security.Security.setProperty("networkaddress.cache.ttl", "10");
}
/**
* Check if an IP address matches. If it has been more than 10 seconds since DNS was last checked for changes to
* the IP address(es) of this FQDN, check again. Then check if the specified IP address belongs to the FQDN.
*/
public synchronized boolean isFrom(String ip) {
long now = System.currentTimeMillis();
if (now > nextcheck) {
nextcheck = now + 10000;
ArrayList<String> hostAddrArray = new ArrayList<>();
try {
InetAddress[] addrs = InetAddress.getAllByName(fqdn);
for (InetAddress addr : addrs) {
hostAddrArray.add(addr.getHostAddress());
}
} catch (UnknownHostException e) {
logger.error("IsFrom: UnknownHostEx: " + e.toString(), e);
}
ips = hostAddrArray.toArray(new String[0]);
logger.debug("IsFrom: DNS ENTRIES FOR FQDN " + fqdn + " : " + Arrays.toString(ips));
}
for (String ipAddr : ips) {
if (ipAddr.equals(ip)) {
return true;
}
}
return false;
}
synchronized boolean isReachable(String ip) {
try {
if (InetAddress.getByName(ip).isReachable(1000)) {
return true;
}
} catch (UnknownHostException e) {
logger.error("IsFrom: UnknownHostEx: " + e, e);
} catch (IOException e) {
logger.error("IsFrom: Failed to parse IP : " + ip + " : " + e, e);
}
return false;
}
/**
* Return the fully qualified domain name.
*/
public String toString() {
return (fqdn);
}
}
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